A lone Bitcoin miner running just 6 terahashes per second (TH/s) of hashpower—so small it barely registers on the network—successfully mined a full BTC block on Friday, earning 3.146 BTC plus fees, valued at nearly $265,000.

The achievement was confirmed by Solo CK pool creator Con Kolivas, who noted the miner faced “only a one in 180 million chance” of solving a block on any given day.

The winning miner controls a minuscule 0.0000007% of Bitcoin’s total network hashpower, which recently reached a record 855.7 exahashes per second (EH/s).

This block marks the 308th ever mined through CKpool since its launch in 2014 and the first in roughly three months. CKpool allows miners to solo mine using the pool’s infrastructure, meaning the winning address keeps the full block reward minus a 2% fee.

Friday’s win is among the luckiest solo-mined blocks in recent memory. In 2022, a solo miner with 126 TH/s beat odds of roughly 1 in 1.3 million to secure a block—but the gap between Friday’s miner and the network hash rate makes this achievement far more improbable.

The winning wallet had submitted shares to the pool as usual. However, with just 6 TH/s—the output of a single older-generation ASIC—the miner would normally expect to find a block only after hundreds of years of continuous mining.

Solo mining has become increasingly rare as Bitcoin’s network hash rate climbs, enhancing network security but dramatically lowering the likelihood that small-scale miners can successfully capture a block.